What was the SIZE of the Black Upright-perching Water-like bird you saw in Ohio?

Thick-billed Murre: Medium-sized seabird with black upperparts, head and neck, and white underparts. A thin, white stripe extends from bill to cheek. The bill is short and black. Legs and feet are black. Feeds on fish, marine worms, crustaceans and squid. Strong swift flight low over water.

Black Guillemot Adult: Medium-sized seabird, black body with a large white wing patch and a dark, pointed bill. In flight white auxillaries and underwing linings are visible. Legs and feet are red. It flies low over the water with rapid wing beats. The inside of their mouth is bright orange.

Ancient Murrelet: Small, pelagic seabird with black head and dark gray back and wings. White underparts extend up onto the face as a cheek patch. Bill is short and yellow with a blackish tip. An open ocean species vaguely resembling a small penguin that can fly. Swift, direct, and low flight.

Anhinga: Large, dark waterbird with long tail, snake-like neck, small head, red eyes, and long olive-brown bill. Body is green-black overall with silver-gray feathers appearing speckled and grizzled on upper back and forewings. AKA snakebird and water turkey. Often soars like a raptor.